US20060066568A1 - Computer pointing device with motion-driven electromagnetic induction module - Google Patents
Computer pointing device with motion-driven electromagnetic induction module Download PDFInfo
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- US20060066568A1 US20060066568A1 US10/955,514 US95551404A US2006066568A1 US 20060066568 A1 US20060066568 A1 US 20060066568A1 US 95551404 A US95551404 A US 95551404A US 2006066568 A1 US2006066568 A1 US 2006066568A1
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- Prior art keywords
- pointing device
- computer pointing
- electromagnetic induction
- induction module
- control system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03543—Mice or pucks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3215—Monitoring of peripheral devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/325—Power saving in peripheral device
- G06F1/3259—Power saving in cursor control device, e.g. mouse, joystick, trackball
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- Computer pointing devices may take various forms, including that of a mouse, pen or trackball. Some CPDs are powered by batteries or are connected to other devices (e.g., portable computers) that are powered by batteries. As a result, it is often desirable to minimize the power consumption of these CPDs, or to provide a convenient means for recharging these CPDs.
- a computer pointing device comprises a navigation module, an electronic control system, and a motion-driven electromagnetic induction module.
- the electronic control system serves to activate and deactivate the navigation module. At times, the control system enters a sleep mode and deactivates the navigation module.
- the motion-driven electromagnetic induction module In response to movement of the computer pointing device, the motion-driven electromagnetic induction module generates an output signal that wakes the control system and activates the navigation module.
- a computer pointing device comprises a housing, a battery, and a motion-driven electromagnetic induction module.
- the electromagnetic induction module is coupled to the battery, is enclosed within the housing, and is unconnected to any externally manipulable portion of the computer pointing device. Movement of the computer pointing device causes the electromagnetic induction module to charge the battery.
- FIG. 1 provides a block diagram of an exemplary computer pointing device (CPD);
- FIG. 2 illustrates an exemplary embodiment of the motion-driven electromagnetic induction module that forms part of the FIG. 1 CPD;
- FIGS. 3 & 4 illustrate exemplary form factors for the CPD shown in FIG. 1 .
- FIG. 1 provides a block diagram of an exemplary computer pointing device (CPD) 100 .
- the CPD 100 could take the form of a mouse, pen or trackball.
- the CPD 100 comprises an electronic control system 102 , a navigation module 104 , a motion-driven electromagnetic induction module 106 , and an optional battery 108 .
- the navigation module 104 acquires data from which movements of the CPD 100 (e.g., changes in CPD position or direction of CPD movement) may be determined.
- the navigation module 104 may be an optical navigation module, such as the ADNS-2051 High-Performance Optical Mouse Sensor marketed by Agilent Technologies, Inc.
- an optical sensor 110 such as a charge coupled device (CCD) or complimentary metal-oxide semiconductor (CMOS) sensor acquires a series of pictures of a surface over which it is moved.
- CCD charge coupled device
- CMOS complimentary metal-oxide semiconductor
- the optical navigation module compares and pattern matches consecutive ones of the pictures to determine how the CPD 100 has moved. If the navigation module 104 is an optical one, it may also comprise a surface illumination device 112 (e.g., a light emitting diode (LED) or laser diode) to illuminate the surface being sensed by its optical sensor 110 .
- the sensed surface may be a desk, a mouse pad, the surface of a trackball, or any other random surface over which the navigation module of the CPD 100 is moved.
- the control system 102 and navigation module 104 both require power to perform their respective functions. As shown in FIG. 1 , this power may be derived from the CPD's own battery 108 . In this manner, the CPD 100 may operate as a wireless device. Alternately, the CPD 100 may be powered by an external power source, such as a computer to which the CPD 100 is connected via a universal serial bus (USB). The computer, in turn, may derive its power from an internal battery, or an external direct current (DC) or alternating current (AC) power source.
- DC direct current
- AC alternating current
- the CPD 100 receives its power from a battery (e.g., either its own battery 108 , or that of a computer to which it is attached), use of the CPD 100 subjects the battery 108 to a current draw which tends to discharge the battery 108 . If the rate of battery discharge is significant, the CPD's user may become dissatisfied with the CPD 100 (or, when making an initial purchase decision, a consumer may choose not to purchase the CPD 100 ).
- the control system 102 may therefore serve to activate and deactivate the navigation module 104 .
- One way in which the control system 102 may activate and deactivate the navigation module 104 is on a periodic basis.
- the navigation module 104 can be periodically activated to check for CPD movement and, absent movement, the navigation module 104 can be deactivated until a next periodic activation.
- Another way in which the control system 102 may deactivate the navigation module 104 is by entering a sleep mode.
- the sleep mode may apply to activity of the control system 102 as a whole, or only to those portions of the control system 102 that activate and deactivate the navigation module 104 .
- the sleep mode of the control system 102 may be entered, for example, whenever the CPD 100 is not moving, or when the control system 102 determines that the CPD 100 has not been moved for a predetermined amount of time. In some cases, the control system 102 may use both of these methods, as well as others, to activate and deactivate the navigation module 104 and thereby conserve battery power.
- the motion-driven electromagnetic induction module 106 provides a means for waking the control system 102 of the CPD 100 (or at least that part of the control system that serves to activate and deactivate the navigation module 104 .
- the electromagnetic induction module 106 may wake the control system 102 by generating an output signal provided to a “wake-up” or “interrupt” input of a microcontroller (e.g., control system 102 ). That is, in response to movement of the CPD 100 , the electromagnetic induction module 106 generates an output signal that wakes the control system 102 and activates the CPD's navigation module 104 .
- the electromagnetic induction module 106 additionally (or alternately) provides a means for charging the CPD's battery 108 .
- the electromagnetic induction module 106 may comprise a number of permanent magnets that form a magnetic field.
- the pertinent magnetic field is created between two adjacent magnets 200 , 202 .
- the module 106 further comprises a conductor 204 that is positioned within the magnetic field.
- the conductor 204 takes the form of a wire that is coiled about a suspended rod 206 .
- the rod 206 may be suspended via one or more springs 208 , 210 .
- the spring(s) 208 , 210 provide a week stabilizing force to the rod 206 , such that low-amplitude background vibrations (or noise) in a CPD's environment will not trigger movement of the rod 206 ; yet small, purposeful movements of the CPD 100 readily move the rod 206 (e.g., swing, bounce or rotate it).
- the magnet(s) 200 , 202 and conductor 204 are mounted in other ways that provide relative movement therebetween during movement of the CPD 100 in which they are mounted.
- the conductor 204 itself may formed as a clock spring or weekly-biased leaf spring.
- the conductor 204 could be attached to a pendant mass that is suspended via a gyroscope or other pendulum movement.
- the conductor's position could be fixed, and one or more of the magnets 200 , 202 forming the magnetic field could be mounted to swing, slide or rotate during movement of the CPD 100 .
- the magnetic field experienced by the conductor 204 is subject to change; and, according to Faraday's Law, a change in the magnetic environment of a coiled conductor 204 induces an electromotive force (i.e., an e.m.f. or voltage) in the conductor 204 .
- the induced e.m.f. may be variously expressed as: e . m .
- the permanent magnets 200 , 202 each have a flux density of 1.0 Tesla, the number of times the conductor 204 winds around the rod 206 is 10,000, the diameter of the conductor coil is 2.0 mm, and the maximum velocity of the conductor coil is 0.03 meters per second. Substituting these numbers into equation (2) demonstrates that the maximum e.m.f. induced in the conductor 204 is 1.885 Volts. Such a voltage is more than sufficient to be recognized by most microcontrollers 102 as a “wake-up” or “interrupt” signal.
- any e.m.f. that is not used to wake-up the control system 102 may be used to charge the battery 108 .
- a bridge rectifier circuit 212 and capacitor (C) coupled between the electromagnetic induction module 106 and the battery 108 , may be used to rectify and store the different polarities of induced e.m.f. that are generated as the conductor 204 in different directions. The charge on the capacitor may then be used to charge the battery.
- control system 102 may re-enter a sleep state anytime the electromagnetic induction module 106 ceases to provide a sufficient wake-up voltage to the control system 102 . Given that movements in the module 106 may continue after a user has stopped moving the CPD 100 , the control system 102 may remain active and ready for some time after the user has stopped moving the CPD 100 . To further ensure an “armed and ready” state of the CPD 100 , the control system 102 may be configured to enter its sleep mode a predetermined amount of time after the electromagnetic induction module 106 ceases to generate an output signal that is sufficient to wake the control system 102 .
- the CPD 100 may be contained within variously shaped housings 300 , 400 , including one that is mouse-shaped 300 ( FIG. 3 ) or one that is pen-shaped 400 ( FIG. 4 ).
- the components 102 - 112 of the CPD 100 are preferably enclosed within the housing 300 or 400 , and are unconnected to any externally manipulable portion of the CPD 100 . In this manner, none of the moving parts of the CPD 100 (and, in particular, the electromagnetic induction module 106 ) present themselves externally to the CPD 100 , and the moving parts of the CPD 100 are sealed off from contamination.
- the electromagnetic induction module 106 shown in FIG. 1 is used to wake a control system 102 and activate a navigation module 104 of the CPD 100 , it is also contemplated that the electromagnetic induction module 106 might not be used to wake a control system 102 or activate a navigation module 104 . That is, in some cases, the electromagnetic induction module 106 described herein might only be used for battery recharge purposes.
- the motion-driven electromagnetic induction module 106 can provide varying degrees of power conservation for a CPD 100 . To a user, this may translate into fewer battery replacements, or less downtime while batteries 108 are charged in a wired or cradle environment.
- a motion-driven electromagnetic induction module 106 may be especially useful in a wireless CPD, its use is not so limited. For example, use of the electromagnetic induction module 106 in a wired device connected to a portable computer may help conserve the battery power of the portable computer.
- the motion-driven electromagnetic induction module 106 can also be advantageous in that it uses no power to detect CPD movement, and it provides a more or less real-time indication of CPD activity or inactivity. Unlike capacitive wake-up sensors, a user that merely rests a hand on their CPD 100 , and does not move their CPD 100 , will not cause their CPD 100 to activate its navigation module 104 and drain its battery 108 .
- the motion-driven electromagnetic induction module 106 disclosed herein can be used to prevent optical image acquisition except when the CPD 100 is actually moving.
Abstract
Description
- Computer pointing devices (CPDS) may take various forms, including that of a mouse, pen or trackball. Some CPDs are powered by batteries or are connected to other devices (e.g., portable computers) that are powered by batteries. As a result, it is often desirable to minimize the power consumption of these CPDs, or to provide a convenient means for recharging these CPDs.
- In one embodiment, a computer pointing device comprises a navigation module, an electronic control system, and a motion-driven electromagnetic induction module. The electronic control system serves to activate and deactivate the navigation module. At times, the control system enters a sleep mode and deactivates the navigation module. In response to movement of the computer pointing device, the motion-driven electromagnetic induction module generates an output signal that wakes the control system and activates the navigation module.
- In another embodiment, a computer pointing device comprises a housing, a battery, and a motion-driven electromagnetic induction module. The electromagnetic induction module is coupled to the battery, is enclosed within the housing, and is unconnected to any externally manipulable portion of the computer pointing device. Movement of the computer pointing device causes the electromagnetic induction module to charge the battery.
- Other embodiments are also disclosed.
- Illustrative and presently preferred embodiments of the invention are illustrated in the drawings, in which:
-
FIG. 1 provides a block diagram of an exemplary computer pointing device (CPD); -
FIG. 2 illustrates an exemplary embodiment of the motion-driven electromagnetic induction module that forms part of theFIG. 1 CPD; and -
FIGS. 3 & 4 illustrate exemplary form factors for the CPD shown inFIG. 1 . -
FIG. 1 provides a block diagram of an exemplary computer pointing device (CPD) 100. By way of example, theCPD 100 could take the form of a mouse, pen or trackball. - The
CPD 100 comprises anelectronic control system 102, anavigation module 104, a motion-drivenelectromagnetic induction module 106, and anoptional battery 108. In use, thenavigation module 104 acquires data from which movements of the CPD 100 (e.g., changes in CPD position or direction of CPD movement) may be determined. In one embodiment, thenavigation module 104 may be an optical navigation module, such as the ADNS-2051 High-Performance Optical Mouse Sensor marketed by Agilent Technologies, Inc. In an optical navigation module, anoptical sensor 110 such as a charge coupled device (CCD) or complimentary metal-oxide semiconductor (CMOS) sensor acquires a series of pictures of a surface over which it is moved. The optical navigation module then compares and pattern matches consecutive ones of the pictures to determine how theCPD 100 has moved. If thenavigation module 104 is an optical one, it may also comprise a surface illumination device 112 (e.g., a light emitting diode (LED) or laser diode) to illuminate the surface being sensed by itsoptical sensor 110. The sensed surface may be a desk, a mouse pad, the surface of a trackball, or any other random surface over which the navigation module of theCPD 100 is moved. - The
control system 102 andnavigation module 104 both require power to perform their respective functions. As shown inFIG. 1 , this power may be derived from the CPD'sown battery 108. In this manner, the CPD 100 may operate as a wireless device. Alternately, the CPD 100 may be powered by an external power source, such as a computer to which the CPD 100 is connected via a universal serial bus (USB). The computer, in turn, may derive its power from an internal battery, or an external direct current (DC) or alternating current (AC) power source. - If the
CPD 100 receives its power from a battery (e.g., either itsown battery 108, or that of a computer to which it is attached), use of theCPD 100 subjects thebattery 108 to a current draw which tends to discharge thebattery 108. If the rate of battery discharge is significant, the CPD's user may become dissatisfied with the CPD 100 (or, when making an initial purchase decision, a consumer may choose not to purchase the CPD 100). Thecontrol system 102 may therefore serve to activate and deactivate thenavigation module 104. One way in which thecontrol system 102 may activate and deactivate thenavigation module 104 is on a periodic basis. In this manner, thenavigation module 104 can be periodically activated to check for CPD movement and, absent movement, thenavigation module 104 can be deactivated until a next periodic activation. Another way in which thecontrol system 102 may deactivate thenavigation module 104 is by entering a sleep mode. The sleep mode may apply to activity of thecontrol system 102 as a whole, or only to those portions of thecontrol system 102 that activate and deactivate thenavigation module 104. The sleep mode of thecontrol system 102 may be entered, for example, whenever theCPD 100 is not moving, or when thecontrol system 102 determines that theCPD 100 has not been moved for a predetermined amount of time. In some cases, thecontrol system 102 may use both of these methods, as well as others, to activate and deactivate thenavigation module 104 and thereby conserve battery power. - In one embodiment, the motion-driven
electromagnetic induction module 106 provides a means for waking thecontrol system 102 of the CPD 100 (or at least that part of the control system that serves to activate and deactivate thenavigation module 104. By way of example, theelectromagnetic induction module 106 may wake thecontrol system 102 by generating an output signal provided to a “wake-up” or “interrupt” input of a microcontroller (e.g., control system 102). That is, in response to movement of theCPD 100, theelectromagnetic induction module 106 generates an output signal that wakes thecontrol system 102 and activates the CPD'snavigation module 104. In another embodiment, theelectromagnetic induction module 106 additionally (or alternately) provides a means for charging the CPD'sbattery 108. - As shown in
FIG. 2 , theelectromagnetic induction module 106 may comprise a number of permanent magnets that form a magnetic field. InFIG. 2 , the pertinent magnetic field is created between twoadjacent magnets module 106 further comprises aconductor 204 that is positioned within the magnetic field. InFIG. 2 , theconductor 204 takes the form of a wire that is coiled about a suspendedrod 206. By way of example, therod 206 may be suspended via one ormore springs rod 206, such that low-amplitude background vibrations (or noise) in a CPD's environment will not trigger movement of therod 206; yet small, purposeful movements of theCPD 100 readily move the rod 206 (e.g., swing, bounce or rotate it). - In alternate embodiments of the motion-driven
electromagnetic induction module 206, the magnet(s) 200, 202 andconductor 204 are mounted in other ways that provide relative movement therebetween during movement of theCPD 100 in which they are mounted. For example, theconductor 204 itself may formed as a clock spring or weekly-biased leaf spring. Or, theconductor 204 could be attached to a pendant mass that is suspended via a gyroscope or other pendulum movement. Alternately, the conductor's position could be fixed, and one or more of themagnets CPD 100. - In any of the above-described embodiments of the
electromagnetic induction module 106, the magnetic field experienced by theconductor 204 is subject to change; and, according to Faraday's Law, a change in the magnetic environment of acoiled conductor 204 induces an electromotive force (i.e., an e.m.f. or voltage) in theconductor 204. The induced e.m.f. may be variously expressed as: - For a coiled
conductor 204 having N turns, the above equation may be rewritten as:
e.m.f.=B*(N*π*D)*V Volts where Tr*D is the perimeter of the coil (2) - Referring to the
electromagnetic induction module 106 shown inFIG. 2 , assume now that, by way of example, thepermanent magnets conductor 204 winds around therod 206 is 10,000, the diameter of the conductor coil is 2.0 mm, and the maximum velocity of the conductor coil is 0.03 meters per second. Substituting these numbers into equation (2) demonstrates that the maximum e.m.f. induced in theconductor 204 is 1.885 Volts. Such a voltage is more than sufficient to be recognized bymost microcontrollers 102 as a “wake-up” or “interrupt” signal. - Any e.m.f. that is not used to wake-up the
control system 102 may be used to charge thebattery 108. As shown inFIG. 2 , abridge rectifier circuit 212 and capacitor (C), coupled between theelectromagnetic induction module 106 and thebattery 108, may be used to rectify and store the different polarities of induced e.m.f. that are generated as theconductor 204 in different directions. The charge on the capacitor may then be used to charge the battery. - To conserve maximum power, the
control system 102 may re-enter a sleep state anytime theelectromagnetic induction module 106 ceases to provide a sufficient wake-up voltage to thecontrol system 102. Given that movements in themodule 106 may continue after a user has stopped moving theCPD 100, thecontrol system 102 may remain active and ready for some time after the user has stopped moving theCPD 100. To further ensure an “armed and ready” state of theCPD 100, thecontrol system 102 may be configured to enter its sleep mode a predetermined amount of time after theelectromagnetic induction module 106 ceases to generate an output signal that is sufficient to wake thecontrol system 102. - As shown in
FIGS. 3 & 4 , theCPD 100 may be contained within variously shapedhousings FIG. 3 ) or one that is pen-shaped 400 (FIG. 4 ). As shown, the components 102-112 of theCPD 100 are preferably enclosed within thehousing CPD 100. In this manner, none of the moving parts of the CPD 100 (and, in particular, the electromagnetic induction module 106) present themselves externally to theCPD 100, and the moving parts of theCPD 100 are sealed off from contamination. - Although the
electromagnetic induction module 106 shown inFIG. 1 is used to wake acontrol system 102 and activate anavigation module 104 of theCPD 100, it is also contemplated that theelectromagnetic induction module 106 might not be used to wake acontrol system 102 or activate anavigation module 104. That is, in some cases, theelectromagnetic induction module 106 described herein might only be used for battery recharge purposes. - Depending on the application, the motion-driven
electromagnetic induction module 106 can provide varying degrees of power conservation for aCPD 100. To a user, this may translate into fewer battery replacements, or less downtime whilebatteries 108 are charged in a wired or cradle environment. Although a motion-drivenelectromagnetic induction module 106 may be especially useful in a wireless CPD, its use is not so limited. For example, use of theelectromagnetic induction module 106 in a wired device connected to a portable computer may help conserve the battery power of the portable computer. - The motion-driven
electromagnetic induction module 106 can also be advantageous in that it uses no power to detect CPD movement, and it provides a more or less real-time indication of CPD activity or inactivity. Unlike capacitive wake-up sensors, a user that merely rests a hand on theirCPD 100, and does not move theirCPD 100, will not cause theirCPD 100 to activate itsnavigation module 104 and drain itsbattery 108. And, unlike CPD's that power-cycle their optical sensors more frequently when their optical sensors acquire different image readings as a result of a focusing problem (i.e., when the CPD moves only slightly on a surface with extraordinary detail, or when the CPD senses different images as a result of not resting on a surface at all), the motion-drivenelectromagnetic induction module 106 disclosed herein can be used to prevent optical image acquisition except when theCPD 100 is actually moving.
Claims (17)
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US10/955,514 US8305343B2 (en) | 2004-09-30 | 2004-09-30 | Computer pointing device with motion-driven electromagnetic induction module |
CNA2005100906591A CN1755600A (en) | 2004-09-30 | 2005-08-18 | Computer pointing device with motion-driven electromagnetic induction module |
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US10/955,514 US8305343B2 (en) | 2004-09-30 | 2004-09-30 | Computer pointing device with motion-driven electromagnetic induction module |
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US8305343B2 US8305343B2 (en) | 2012-11-06 |
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